I seem to have a slight misfire under hard acceleration from low rpm. If i accelerate normally than everything seems to be fine. I'm going to be running some test of the coil packs when it gets a bit warmer, it snowed here in Atlanta, GA (USA). I will be working to confirm that it is a misfire. I have a set of RB26 coil packs that I'm going to make sure a cleaned up in top notch shape. I have seen some things on applying liquid tape to them and wrapping the extensions with electrical tape to keep them form grounding out. Also the car seems to have a bad idle after getting to operating temp. I think that may just be poor idle setting or tune. I will be checking into that also. I did not think to state that the RB25DET is swapped into a 1995 240sx S14. I guess my thinking was to optimize spark for smoother running motor by really making sure the fuel gets burned well.